Its not that bad, all your broadcast digital video like this uses a lossy compression so your loosing a few bits there and there anyway. When you do drop some bits is when you see the blocky look on the screen as whole packets get dropped then you start to drop too many and the display get blanked.

Its the same as the little satalite dishes when they get covered with snow, your signal startes to get blocky then goes away.
The real annoying thing is when your aying for cable tv and it gets blocky so you can tell they are just forwarding a signal from a little dish, might as well just get the dish.